Matthias Härtig born in 1977, engineer in the arts, programmer for artistic interactive visual applications, real-time- visual environments, living in Dresden. Initiator of the working cooperative DS-X.org, founding member of the Trans-Media Akademie Hellerau (TMA). He collaborates with Frieder Weiss on many projects to develop interactive visuals especially designed for use with dance, theatre, music and computer arts, based on the video sensing program Kalypso (developed by Frieder Weiss). Together with Ulf Langheinrich, he is developing a modular toolkit based on MAX and Open GL. Other ongoing collaborations with: Johanna Roggan, shotAG, Phase7 and Waldorfschule Dresden.